Re: [RFC PATCH 5/6] implement per-cpu&per-domain state machine call_srcu()

[Lai Jiangshan]

>
>> +               }
>> +       }
>> +       spin_unlock_irq(&sp->gp_lock);
>> +
>> +       flush_workqueue(srcu_callback_wq);
>
> Since you already waited for the completions one by one, what's the
> purpose of this?

srcu callbacks are preemptible/sleepable here, so they may not
complete in order,
some may not finish here. so srcu_barrier() needs to wait them.


>
>> +}
>> +EXPORT_SYMBOL_GPL(srcu_barrier);
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